As per usual, here are some lujvo I'm thinking of coining, but first seeking approval (or disapproval):
1) zilmosycpina: the contact/rubbing between m2 and m3 is hair-raising/sets one's teeth on edge/squicks/gives the willies/heebie-jeebies through sense c2; m2 grides against m3.
Example: lo'e jgalu lo'e bakryta'o cu tirna zilmosycpina ga'a ro ka'u remna
Notes: This is an implicit-abstraction lujvo. The -zil- is there because I think the friction produced is irrelevant. zilmosycpina is a very subjective quality, so I'm not entirely happy with {zilmosycpina}, because it has no observer place. {zilmosycpina} is only used over plain {cpina} when unambiguous reference to /this particular type of unpleasant feeling/ is desired.
2) vlamo'itoi: t1 struggles to remember how to say/write/sign [express] word v1, almost but not quite getting it; v1 is at the tip of t1's tongue.
Notes: This concept has a surprisingly hefty Wikipedia article:
http://en.wikipedia.org/wiki/Tip_of_the_tongue
3) terserspaji
: sp2 is surprised by step st3 while traversing stairs, surprised either that it exists or that it doesn't exist; sp2 unexpectedly hits floor when expecting to step on step st3; sp2 unexpectedly hits step st3 when expecting to step on floor.
Example: le mamta be mi cu morsi .iri'abo terserspaji zo'onai
Notes: If you've never terserspaji'd, e.g. because you can't walk, see
http://www.answerbag.com/q_view/1232051
4) And finally, an experiment. Here's yet another of these lujvo: {selsnemojmo'i}. What meaning do you think I have in mind for it?